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Index › Processing Development › Libraries,  Tool Development › How do you use "color" in your lib
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How do you use "color" in your lib? (Read 1091 times)
leRiCl
How do you use "color" in your lib?
Apr 6th, 2007, 7:57am  
I am trying to learn java by writing new libs for processing. (I've mastered processing...)... I've managed to create simple libs that only do stuff to the console. Now I want to make one that draws something.
but I couldn't even go "color BorderColor"... in

class button
color BorderColor
...etc.

Although I know how to use processing core methods, like "parent.println("line")".

Thanks
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fjen
Re: How do you use "color" in your lib?
Reply #1 - Apr 6th, 2007, 8:23am  
color = int

int myColor = color(0,0,0); // black

ben: i think things like this should maybe go into the libraries page

F
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JohnG
Re: How do you use "color" in your lib?
Reply #2 - Apr 6th, 2007, 10:09am  
To add to what fjen said, color isn't really a type, processing translates it to an int behind the scenes when you hit the run button on a sketch. So you can just treat is as an int most fo the time, and will probably make things quicker if you do bit-munging on it rather than using red() green() etc..
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leRiCl
Re: How do you use "color" in your lib?
Reply #3 - Apr 7th, 2007, 5:37am  
Yeah... I was kinda stumped when I could use "PFont" and "PImage" but not color.... heh.
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Robin
Re: How do you use "color" in your lib?
Reply #4 - Nov 11th, 2007, 5:56pm  
Hello,

I've been trying to get this working in netbeans, but I can't...here's a snippet of code:



class pattern {
   
   int strokeColour;
   int fillColour;


  //constuructor
   public pattern(gui g, String name) {  
       
       theGui = g;
   
       //colours
       fillColour = color(255,150,40);
       strokeColour = color(255,100,40);

       ...
}

I get this error:

symbol  : method color(int,int,int)
location: class com.robinfencott.pattern
       fillColour = color(255,150,40);
1 error
BUILD FAILED (total time: 0 seconds)


Any idea what am I doing wrong?

Kind regards,
Robin.
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taifunbrowser
Re: How do you use "color" in your lib?
Reply #5 - Jan 9th, 2008, 4:47am  
all of processing's methods are actually instance methods of the class "PGraphics". So,

Possibilities:
  • make your pattern class extend PApplet, and its the main class. (probably not what you want)
  • Pass a PApplet as a parameter, and then call (g.color(int,int,int)
  • Make your PApplet a Singleton of its class:
      MyPApplet.getInstance().color(int,int,int)

    Of course, if you get the source code for processing, you could figure out what the color method does for each colorspace, copy the code, de-genericize it for just 1 specific colorspace, and make it a static-method in your classes.

    Decisions, decisions... have fun!
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    com-kee
    Re: How do you use "color" in your lib?
    Reply #6 - Feb 4th, 2008, 10:37pm      
    I just wrote a smart class with a bunch of static methods for the color creation. It's been a part of a workshop at my university and I think no "real" crack got in touch with it jet. Would be nice to get some feedback.

    Color.java: http://interface.fh-potsdam.de/beyond_processing/wiki/lecture/java/shapelib/src/edu/fhp/shapeLib/util/Color.java

    documentation: http://interface.fh-potsdam.de/beyond_processing/wiki/doku.php?id=colors
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    JohnG
    Re: How do you use "color" in your lib?
    Reply #7 - Feb 4th, 2008, 10:56pm      
    Erk! There's absolutely no reason to go via Strings and "Long" to get a simple int value...

    return (int)Long.parseLong(String.format("%02X%02X%02X%02X",theAlpha, theGrey, theGrey, theGrey), 16);

    can be just:
    return (theAlpha<<24)+(theGrey<<16)+(theGray<<8)+theGrey;

    Or

    return (theAlpha<<24)+(theRed<<16)+(theGreen<<8)+theBlue;

    Also in your final method rgb(int,int,int,int), your 2nd Alpha test is wrong, it should be >255, not >0
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